66944690 has 8 divisors (see below), whose sum is σ = 120500460. Its totient is φ = 26777872.

The previous prime is 66944681. The next prime is 66944741. The reversal of 66944690 is 9644966.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 65141041 + 1803649 = 8071^2 + 1343^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×66944690² = 8963183038392200, which contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3347225 + ... + 3347244.

Almost surely, 2^66944690 is an apocalyptic number.

66944690 is a deficient number, since it is larger than the sum of its proper divisors (53555770).

66944690 is a wasteful number, since it uses less digits than its factorization.

66944690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6694476.

The product of its (nonzero) digits is 279936, while the sum is 44.

The square root of 66944690 is about 8181.9734783242. The cubic root of 66944690 is about 406.0430159799.

The spelling of 66944690 in words is "sixty-six million, nine hundred forty-four thousand, six hundred ninety".